EP0051555B1 - Schutzschaltungs-Vorrichtung für einen Gleichstrommotor, insbesondere für einen Drucker-Aufwickel-Gleichstrommotor - Google Patents

Schutzschaltungs-Vorrichtung für einen Gleichstrommotor, insbesondere für einen Drucker-Aufwickel-Gleichstrommotor Download PDF

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Publication number
EP0051555B1
EP0051555B1 EP81730104A EP81730104A EP0051555B1 EP 0051555 B1 EP0051555 B1 EP 0051555B1 EP 81730104 A EP81730104 A EP 81730104A EP 81730104 A EP81730104 A EP 81730104A EP 0051555 B1 EP0051555 B1 EP 0051555B1
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EP
European Patent Office
Prior art keywords
voltage
motor
input
current
direct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81730104A
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German (de)
English (en)
French (fr)
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EP0051555A1 (de
Inventor
Alfred Babsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0051555A1 publication Critical patent/EP0051555A1/de
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements

Definitions

  • the invention relates to a protective circuit device for a direct current motor, in particular for a printer winding direct current motor, measuring means for deriving a measuring voltage from the motor current and a control transistor for switching the motor current on and off in series with the motor.
  • Such a protective circuit device aims to prevent damage to the motor winding when the load torque reaches impermissible values.
  • Slip clutches were used as mechanical means. However, such clutches are set to a fixed torque, upon reaching which the paper roll no longer rotates.
  • Magnetic clutches are another mechanical means. Such clutches, however, have the disadvantage that they either engage and transmit torque or torque transmission does not take place at all. In the first case, the electric motor is also loaded when it is not possible to turn a winding drive.
  • a DC motor that also delivers a sufficiently high torque when used as a “stepper motor” should therefore be preferred.
  • US-A-3 358 206 relates to a control circuit for a DC motor, a current limiting circuit being provided.
  • the control circuit consists of an oscillator, a bistable multivibrator (flip-flop) and a circuit for setting the duty cycle, which applies a control transistor in series with the motor.
  • the current limiting circuit reduces the duration of the control pulses to the transistor when the current in the motor exceeds a predetermined level.
  • the current in the motor is measured by means of a series resistor, which supplies a voltage proportional to the motor current to a thyristor connected as a comparator. If the motor current or the voltage across the measuring resistor exceeds the predetermined level, the current limiting circuit interrupts the power supply to the motor. However, the motor is activated again after a certain time delay. This time delay is determined by a capacitor that is charged by resistors and discharged by another circuit.
  • the invention has for its object to provide a protective circuit device for a DC motor of the type mentioned, which switches off the motor when it requires an impermissibly high torque, but causes it to restart and continue to turn as soon as the impermissibly high torque decreases or the associated high current drops.
  • a flip-flop with an output which, in the active state, conducts the control transistor, with a threshold input which switches the output to inactive when the voltage at the threshold input is above an upper voltage limit, and with a further input, which switches the output active when the voltage at the further input is below a lower voltage limit, and by a capacitor connected to the output of the measuring device, which outputs the voltages to the inputs of the multivibrator, the capacitor being charged by the measuring voltage with a certain time constant and, if the flip-flop is inactive, it is discharged through another circuit with a time constant that is approx. 10 times longer.
  • the drawing consists of an electrical circuit diagram, which is based on the winding drive of a matrix printer.
  • the DC motor 1 a is located in the load circuit 2a and is controlled by a control transistor T2, which receives the base current via a trigger circuit T1 and a downstream resistor R5, which limits the current for the base of the control transistor T2 from the trigger circuit T1.
  • the resistor R1 represents a current measuring resistor between the control transistor T2 and the DC motor 1 a.
  • the control transistor T2 (with transistors of the Type NPN) is located at output 3 of flip-flop T1, the connection 1 of which is connected to ground.
  • a resistor R4 which is dimensioned such that the threshold voltage at input 6 is shifted to the desired voltage range, is connected to input 5. Otherwise input 5 is not connected.
  • Input 6 determines the voltage at which output 3 is switched inactive, and input 2 the switching to the active state.
  • a measuring point 4a which leads via resistors R2 and R3 to a capacitor C1, which in turn is connected to ground with the negative pole.
  • the positive pole of capacitor C1 is at input 2 of trigger circuit T1.
  • a diode Di 1 is connected in parallel with the resistor R3. The on / off ratio at the flip-flop T1 is determined by the ratio of the resistors R2 / R3.
  • the flip-flop T1 is supplied with current from the load circuit 2a via a series resistor R6.
  • the flip-flop T1 When the flip-flop T1 is switched on, ie when the supply voltage is applied, the capacitor C1 is discharged. This means that the input T1 2 less than 1/3 of the supply voltage is obtained. In this phase, output 3 is activated. The control transistor T2 then switches on the direct current motor 1a. The DC motor 1a initially absorbs a higher starting current. As soon as the motor rotates at the operating speed, this starting current drops to the operating current value. To enable this start-up, the time constant is dimensioned accordingly by resistor R2.
  • the voltage at measuring point 4a will remain correspondingly high for longer than the time constant determined by R2 / C1.
  • the flip-flop T1 internally switches the output 7 to ground, so that a discharge current from the capacitor C 1 can flow through the resistor R3.
  • the time constant of the link R3 / C1 is selected 10 times as large as that of the link R2 / C1
  • the DC motor 1 a is kept switched off for this 10 times longer time.
  • the flip-flop T1 periodically checks the load current of the DC motor 1 a by this charging and discharging.
  • a flip-flop multivibrator or another flip-flop with a similar or identical behavior can be considered as flip-flop T1.
  • Correspondingly designed Schmitt triggers or window discriminators can also be used.

Landscapes

  • Control Of Direct Current Motors (AREA)
  • Protection Of Generators And Motors (AREA)
  • Control Of Stepping Motors (AREA)
EP81730104A 1980-11-03 1981-10-07 Schutzschaltungs-Vorrichtung für einen Gleichstrommotor, insbesondere für einen Drucker-Aufwickel-Gleichstrommotor Expired EP0051555B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3042138 1980-11-03
DE19803042138 DE3042138A1 (de) 1980-11-03 1980-11-03 Schutzschaltungs-vorrichtung fuer einen gleichstrommotor, insbesondere fuer einen drucker-aufwickel-gleichstrommotor

Publications (2)

Publication Number Publication Date
EP0051555A1 EP0051555A1 (de) 1982-05-12
EP0051555B1 true EP0051555B1 (de) 1984-08-01

Family

ID=6116256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730104A Expired EP0051555B1 (de) 1980-11-03 1981-10-07 Schutzschaltungs-Vorrichtung für einen Gleichstrommotor, insbesondere für einen Drucker-Aufwickel-Gleichstrommotor

Country Status (4)

Country Link
US (1) US4430682A (enrdf_load_stackoverflow)
EP (1) EP0051555B1 (enrdf_load_stackoverflow)
JP (1) JPS57106392A (enrdf_load_stackoverflow)
DE (1) DE3042138A1 (enrdf_load_stackoverflow)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493002A (en) * 1983-02-28 1985-01-08 Westinghouse Electric Corp. Electronic circuit breaker
FR2577725A1 (fr) * 1985-02-15 1986-08-22 Etri Sa Dispositif pour proteger un moteur electrique contre les surintensites
DE3534500A1 (de) * 1985-09-27 1987-04-02 Porsche Ag Ueberlastschutz fuer vorwiderstaende von elektromotoren, insbesondere von elektromotorisch angetriebenen lueftergeblaesen von fahrzeugen
JPH0753385Y2 (ja) * 1986-06-30 1995-12-06 スズキ株式会社 直流モ−タ用駆動装置
DE3642624A1 (de) * 1986-12-13 1988-06-23 Kabelmetal Electro Gmbh Schaltungsanordnung zum Schutz elektronischer Geraete gegen UEberlastung
US4763222A (en) * 1987-04-13 1988-08-09 General Motors Corporation Vehicle suspension control with actuating circuit protection
GB2205402B (en) * 1987-04-20 1991-11-27 Us Energy Seismic sources
US4853820A (en) * 1987-05-11 1989-08-01 Hendry Mechanical Works Electronic circuit breaker systems
FR2632070B1 (fr) * 1988-05-26 1990-11-23 Bendix Electronics Sa Circuit de commande de l'alimentation d'une charge electrique, a dispositif de detection d'un court-circuit de la charge
JPH0756581Y2 (ja) * 1988-08-29 1995-12-25 国産電機株式会社 電動機用過電流遮断装置
US4967304A (en) * 1988-10-11 1990-10-30 General Electric Company Digital circuit interrupter with electric motor trip parameters
JP2779631B2 (ja) * 1988-11-30 1998-07-23 キヤノン株式会社 電源装置
US4979068A (en) * 1989-02-07 1990-12-18 Sobhani Seyd M High speed electronic circuit breaker
JPH0479789A (ja) * 1990-07-20 1992-03-13 Matsushita Electric Ind Co Ltd モータの駆動装置
DE4035067A1 (de) * 1990-11-05 1992-05-14 Teves Gmbh Alfred Schaltungsanordnung zur steuerung eines stellmotors
DE4133302C2 (de) * 1991-10-08 1994-08-25 Jungheinrich Ag Überlastschutz für die Leistungssteuerstufe eines Gleichstrommotors
JP2940843B2 (ja) * 1992-01-23 1999-08-25 三菱電機株式会社 過電流保護方法及びその装置及び過電流検出装置
US5772291A (en) * 1996-02-16 1998-06-30 Mosinee Paper Corporation Hands-free paper towel dispensers
US6695246B1 (en) * 1996-02-16 2004-02-24 Bay West Paper Corporation Microprocessor controlled hands-free paper towel dispenser
US8823464B2 (en) 2011-11-01 2014-09-02 Instituto Potosino de Investigacion Cientifica y Tecnológica A.C. Reconfigurable multivibrator element based on chaos control

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324352A (en) * 1963-06-03 1967-06-06 Tecumseh Products Co Temperature protection circuit
US3358206A (en) * 1965-06-01 1967-12-12 Allis Chalmers Mfg Co Pulse width modulation control systems for controlling direct current motors
US3427506A (en) * 1966-04-04 1969-02-11 Allis Chalmers Mfg Co Voltage responsive pulse width limiting means for pulse modulation system
US3564337A (en) * 1968-12-16 1971-02-16 Thwing Albert Instr Co Motor overload control circuit for material testing machine
DE2250716B1 (de) * 1972-10-16 1974-03-28 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektronische Sicherung mit monostabiler Kippstufe
DE2354846A1 (de) * 1973-11-02 1975-05-07 Bosch Gmbh Robert Schaltanordnung fuer einen verbraucher, insbesondere einen gleichstrommotor
DE2431279A1 (de) * 1974-06-28 1976-01-08 Siemens Ag Steuereinrichtung fuer einen gleichstrommotor, insbesondere fuer einen lueftermotor in einem kraftfahrzeug
DE2517766C3 (de) * 1975-04-18 1982-01-07 Mannesmann AG, 4000 Düsseldorf Schutzschaltung für einen Matrixdrucker
JPS5222715A (en) * 1975-08-14 1977-02-21 Matsushita Electric Ind Co Ltd Protection device for motor and control semiconductor element
US4019096A (en) 1976-06-07 1977-04-19 Rockwell International Corporation Current limiting apparatus
DE2847765C2 (de) * 1978-11-03 1984-02-16 Kaltenbach & Voigt Gmbh & Co, 7950 Biberach Schaltungsanordnung zum Schutz eines Antriebsmotors vor Überlastung, insbesondere für ein zahnärztliches Arbeitsgerät
US4363068A (en) 1980-08-18 1982-12-07 Sundstrand Corporation Power FET short circuit protection

Also Published As

Publication number Publication date
US4430682A (en) 1984-02-07
EP0051555A1 (de) 1982-05-12
JPS6226277B2 (enrdf_load_stackoverflow) 1987-06-08
DE3042138A1 (de) 1982-05-27
JPS57106392A (en) 1982-07-02

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